Sortingshop

* upgrade to wxpython4.2
* drop alias `SortingShop`, only `sortingshop` remains
* drop `setup.py` in favour of `pyproject.toml`

Fix Layout for wxPython >= 4.1.0

fix failing to go to the first / next picture sometimes

First stable release!

Install via

bash
pip install SortingShop


or

bash
pipx install SortingShop